cerulean galleon
Don't know if this has been suggested before ( couldn't find a similar idea )
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All three types of ships ( construction material/Firmarlite transporter, cargo ship, fluid/gas transporter ) should be able to carry more if you spend some science packs to improve them to MK 2+
At least for some time this could be a workaround for the traffic jam(s)
scenic plume
Don't know if this has been suggested before ( couldn't find a similar idea )
#...
did suggest on upgrade node on cargo ships back then by me and by others as well. Currently u can find my post in this section : Research tree node suggestion
frail narwhal
Both cargo size and flight speed might be researched. But for now, is more important to see some info tool, that will show how goods are transported by flying ships.
rustic spindle
Be nice to have them carry more. How about some smaller ones that fit in better, current one are so BIG.